Officer charged over Cronulla pursuit crash

A highway patrol officer has been charged over a high speed crash that left a Cronulla grandmother in a coma.

The 40-year-old senior constable has been charged with dangerous driving occasioning grievous bodily harm more than three weeks after the police car hit Gai Vieira's Mercedes on the Kingsway at Cronulla.

The amount of time taken to lay charges has angered the Vieira family who believe police were trying avoid charging the officer on September 5.

The Vieira family campaigned publicly over delays in the officer being interviewed. (9news)

"It would have been fantastic if they had charged him the first or second day, not the 22nd day. To me they're finding a way out," said Gai's husband Bert Vieira.

Assistant Commissioner Michael Corboy says that's not true, claiming a long investigation by the critical incident team was necessary in order to be thorough.

Gai Vieira remains in a critical condition while her husband, Bert campaigns to stop high-speed pursuits in NSW. (AAP)

"This was a very technically challenging investigation and a lot of those technical issues took a lot longer than we thought," he said.

Gai Vieira's family have spent every day by her bedside at St George Hospital, and have revealed that although she remains in a coma, she is responding to her grandson's voice.

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"She makes a move, her toes, every time she hears Tyler's voice," Bert Vieira said.

"We look at each other and we've almost got tears in our eyes, want to start crying ourselves when we hear it."

They remain optimistic, even though Mrs Vieira is still in a critical condition, visiting and reading to her every day and relaying the hundreds of messages of support the family has received.

The crash left Mrs Vieira with critical brain injuries after a police vehicle ploughed into her car on the Kingsway. (9news)

They have vowed to show up to Sydney's Downing Centre courthouse en masse on November 12, when the police officer appears before a magistrate for the first time, and believe he should be sacked from the force immediately.

They've also vowed to continue fighting until all police pursuits are banned in New South Wales.

An internal investigation revealed the highway patrol car that struck Mrs Vieira did not have its siren or lights on and was travelling at 124km/h in a 70km/h zone.